Features
• 10 μA Maximum Quiescent Power Dissipation
• 22Ω Typical Output On-resistance
• Integrated Bleed Resistors on the Outputs
• Low Parasitic Capacitance
• DC to 50 MHz Small Signal Frequency Response
• -60 dB Typical Off-isolation at 5 MHz
• CMOS Logic Circuitry for Low Power
• Excellent Noise Immunity
• On-chip Shift Register, Latch and Clear Logic
Circuitry
• Flexible High-voltage Supplies

Applications
• Medical Ultrasound Imaging
• Piezoelectric Transducer Drivers

General Description
The HV232 is an 8-channel, low-charge-injection,
high-voltage, analog switch integrated circuit (IC) with
bleed resistors. This device can be used in applications
requiring high-voltage switching controlled by
low-voltage control signals, such as ultrasound imaging
and printers. The bleed resistors eliminate voltage built
up on capacitive loads, such as piezoelectric
transducers. Input data is shifted into an 8-bit Shift
register which can be retained in an 8-bit latch. To
reduce any possible clock feed-through noise, latch
enable (LE) should be left high until all bits are clocked
in. This switch combines high-voltage bilateral DMOS
switches and low-power CMOS logic to provide
efficient control of high-voltage analog signals.
The HV232 is suitable for various combinations of high
-voltage supplies, e.g., VPP/VNN: +40V/-160V and
+100V/-100V, and +160V/-40V.